Other pressure levels can be found similarly. For example, 10% of the atmosphere is located above the altitude where the pressure is mb.

900 mb.

Explanation:

At the altitude of approximately 16.0 km above sea level, the 10% of the atmosphere by weight is above and 90% is below. Thus the average pressure at the mean sea level found to be 1013 Mb and thus the pressure gets decreases at we rise above the altitude.

Here is a picture  of the net. its 4 squares in a row diagonal and on the third draw one square aove and under